Year	Percent
1950	15.4789
1955	16.1567
1960	17.14204
1965	18.10712
1970	18.7816
1975	18.9329
1980	17.53241
1985	18.1138
1990	23.3115
1995	24.09225
2000	24.63667
2005	24.6317
2010	25.59082
2015	26.22356
2020	27.62982
2025	29.33313
2030	30.79357
2035	31.8586
2040	32.65579
2045	33.37911
2050	33.85202
2055	34.13219
2060	34.00992
2065	33.95117
2070	34.25767
2075	34.6199
2080	35.05465
2085	35.45975
2090	35.83339
2095	36.22332
2100	36.69753